1、划分句子成分有助于理解你的问题：
【She主语】【 was fully conscious谓语 】【all the time 时间状语】and 【knew 并列谓语】【what was going on.宾语从句】
2、替换理
what= all/everything/something that
She was fully conscious all the time and knew【all/everything （that was going on定语从句).】

祝你开心如意!that代表all/everything在定语从句中作主语吧？was going on是什么意思呀？